EP0691479B1 - Blind rivet assembly - Google Patents

Blind rivet assembly Download PDF

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Publication number
EP0691479B1
EP0691479B1 EP19950304220 EP95304220A EP0691479B1 EP 0691479 B1 EP0691479 B1 EP 0691479B1 EP 19950304220 EP19950304220 EP 19950304220 EP 95304220 A EP95304220 A EP 95304220A EP 0691479 B1 EP0691479 B1 EP 0691479B1
Authority
EP
European Patent Office
Prior art keywords
rivet
diameter
end portion
mandrel
head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950304220
Other languages
German (de)
French (fr)
Other versions
EP0691479A1 (en
Inventor
Michael Osborne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Newfrey LLC
Original Assignee
Newfrey LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Newfrey LLC filed Critical Newfrey LLC
Publication of EP0691479A1 publication Critical patent/EP0691479A1/en
Application granted granted Critical
Publication of EP0691479B1 publication Critical patent/EP0691479B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B19/00—Bolts without screw-thread; Pins, including deformable elements; Rivets
    • F16B19/04—Rivets; Spigots or the like fastened by riveting
    • F16B19/08—Hollow rivets; Multi-part rivets
    • F16B19/10—Hollow rivets; Multi-part rivets fastened by expanding mechanically
    • F16B19/1027—Multi-part rivets
    • F16B19/1036—Blind rivets
    • F16B19/1045—Blind rivets fastened by a pull - mandrel or the like
    • F16B19/1054—Blind rivets fastened by a pull - mandrel or the like the pull-mandrel or the like being frangible

Definitions

  • This invention is concerned with blind rivet assemblies of the type comprising a rivet body having a shank with a bore extending axially therethrough and a head formed on one end portion of the shank, and a mandrel assembled in the rivet body and comprising a stem portion extending through the bore and a setting head engaged with a tail end face of the rivet body.
  • a blind rivet assembly is set by placing the rivet body in a hole in a work piece and then with a tool while restraining the head of the rivet body against movement, drawing the mandrel through the rivet so that the tail end portion of the rivet is caused to expand and set the rivet in the workpiece.
  • a rivet which is said to be particularly good at accommodating a range of work pieces thicknesses, and comprises a series of grooves around the shank of the rivet body at which the rivet is encouraged to flex on setting:
  • Such a rivet is indeed capable of accepting a range of thicknesses, but the performance of the rivet on setting is somewhat dependent on the relative location of the blind face of the workpiece and the grooves. Further the rivet could not be expected to show good mandrel head retention.
  • a rivet which is specifically designed to give good mandrel head retention - indeed the tail end of the rivet is swaged inwardly to enclose the head of the mandrel.
  • This rivet also comprises grooves intended to give a range of acceptable setting thicknesses. It will be understood that such a rivet not only requires an operation to form the grooves but a further operation on the assembled rivet and mandrel to enclose the head of the mandrel.
  • a rivet body has a shank comprising a cylindrical wall of substantially uniform thickness with portions of different diameter, and a mandrel having a stem with a neck adjacent the junction of the two portions.
  • the present invention provides a blind rivet assembly comprising a rivet body having a shank with a bore extending axially therethrough and a head formed on one end portion of the shank and a mandrel assembled in the rivet body and comprising a stem portion extending through the bore and a setting head engaged with a tail end face of the rivet body.
  • the shank of the rivet body comprises a cylindrical wall of substantially uniform thickness, a head end portion of the wall defining a shank portion of the bore of a first diameter and a tail end portion of the wall defining a tail end portion of the bore of a second, lesser, diameter
  • the stem portion of the mandrel is of substantially uniform diameter, which diameter is less than second lesser diameter of the bore, which stem portion is provided with a neck at which the mandrel may break at the end of a setting operation, which neck is located adjacent the junction between the head end portion and the tail end portion of the wall, and the stem portion has an outwardly extending collar portion of the same diameter as the second diameter of the rivet body bore, which collar is spaced from the neck and the setting head of the mandrel and positioned in the tail end portion of the bore.
  • a blind rivet assembly (2) comprises a rivet body (4) which has a shank (6) with a bore (8) extending axially there through an outwardly extending head (10) formed on one end portion of the shank (6).
  • the assembly also comprises a mandrel (12) assembled in the rivet body and comprising a stem portion (14) which is of substantially uniform diameter and a setting head (16) which is engaged with a tail end face (18) of the rivet body (4).
  • the rivet body is conveniently made by extrusion and is preferably of aluminium alloy though other suitable metals may used.
  • the mandrel (12), which is made by a conventional heading and rolling operation is of mild steel.
  • the shank (6) of the rivet body (4) comprises a cylindrical wall (20) of substantially uniform thickness.
  • a head end portion of the wall (20) defines a shank portion (22) of the bore (8) of a first diameter d 1
  • a tail end portion of the wall (20) defines a tail end portion (24) of the bore (8) of a second diameter d 2 , less than the diameter d 1 .
  • the stem portion (14) of the mandrel is of a substantially uniform diameter M, which is less than the diameter d 2 and thus less than the diameter d 1 .
  • the stem portion (14) is provided with a circumferential neck (26) at which the mandrel (12) will break on the completion of a setting operation on the blind rivet assembly (2).
  • the neck (26) is located adjacent the junction between the head end portion and the tail end portion of the wall (20).
  • the stem (14) is provided, between the neck (26) and the head (16), with an outwardly extending collar portion comprising a plurality, in particular four, of lugs (28) having outer faces which are of the same diameter as the second diameter d 2 of the rivet body.
  • the lugs (28) thus lie in the tail end portion (24) of the bore (8) in contact with the inner surface of the wall (20).
  • the head (16) of the mandrel (12) is of a diameter which is greater than the outer diameter of the tail end portion of the wall (20) and less than the outer diameter of the shank portion of the wall (20).
  • M is 2.9 mm d 1 is 3.5 mm d 2 is 3.0 mm Rivet body outside diameter (D) 4.8 mm Length of tail end portion (L) 5.0 mm
  • the shank of the rivet body (4) is inserted in a hole in a workpiece and a tool is forced to engage the head (10) of the rivet body while drawing the mandrel through the rivet body to set it.
  • increased resistance to movement of the mandrel puts a greater strain on the neck of the mandrel which eventually breaks to complete the setting operation.
  • Figures 2 and 3 show the form of setting achieved with a rivet according to the invention.
  • the rivet assembly (2) has been positioned in a hole through two plates whose combined thicknesses is about the maximum for efficient setting of the rivet.
  • the mandrel head (16) draws the tail end portion of the rivet wall downwards, and it not only extrudes outwards, past and round the outer edge of the mandrel head (16), but it also forces compression of the shank portion of the wall (20).
  • This has two effects - firstly it causes metal to flow so that the portion of the wall in the hole in the workpiece fills the hole, and secondly, because of the gap between the outside of the mandrel, the shank portion of the wall concertinas, folding inwards and outwards.
  • Shortly before the mandrel breaks not only has metal flowed around the outside of the head (16) of the mandrel, but metal also flows either side of the collar portion (28).
  • a setting of the rivet is thus obtained which shows highly desirable characteristics, both in good hole filling ability, reliable and high mandrel head retention after setting, and a well formed head on the set rivet.
  • Figure 3 shows a typical setting of the rivet with a workpiece of a thickness G 2 which is approaching the minimum thickness of work piece with which the rivet can effectively be used.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)

Description

  • This invention is concerned with blind rivet assemblies of the type comprising a rivet body having a shank with a bore extending axially therethrough and a head formed on one end portion of the shank, and a mandrel assembled in the rivet body and comprising a stem portion extending through the bore and a setting head engaged with a tail end face of the rivet body. Such a blind rivet assembly is set by placing the rivet body in a hole in a work piece and then with a tool while restraining the head of the rivet body against movement, drawing the mandrel through the rivet so that the tail end portion of the rivet is caused to expand and set the rivet in the workpiece.
  • The characteristics of a rivet assembly which make it commercially desirable are
  • (a) the ability reliably to obtain good expansion of the tail end portion on setting
  • (b) the ability of the rivet body shank to expand to fill a hole in a workpiece on setting, so that the size of the hole is not critical.
  • (c) the ability to set satisfactorily in a range of workpiece thicknesses and
  • (d) the ability, when desired, reliably to retain the head of the mandrel in the rivet after the rivet has been set.
  • The achievement of these various characteristics necessarily involves a degree of compromise or complication and expense in manufacture.
  • In EP 168355 a rivet is shown which is said to be particularly good at accommodating a range of work pieces thicknesses, and comprises a series of grooves around the shank of the rivet body at which the rivet is encouraged to flex on setting: Such a rivet is indeed capable of accepting a range of thicknesses, but the performance of the rivet on setting is somewhat dependent on the relative location of the blind face of the workpiece and the grooves. Further the rivet could not be expected to show good mandrel head retention. In EP 536957 a rivet is shown which is specifically designed to give good mandrel head retention - indeed the tail end of the rivet is swaged inwardly to enclose the head of the mandrel. This rivet also comprises grooves intended to give a range of acceptable setting thicknesses. It will be understood that such a rivet not only requires an operation to form the grooves but a further operation on the assembled rivet and mandrel to enclose the head of the mandrel.
  • Reference is also made to FR-A-2587767 in which a rivet body has a shank comprising a cylindrical wall of substantially uniform thickness with portions of different diameter, and a mandrel having a stem with a neck adjacent the junction of the two portions.
  • It is an object of the present invention to provide an improved blind rivet assembly.
  • The present invention provides a blind rivet assembly comprising a rivet body having a shank with a bore extending axially therethrough and a head formed on one end portion of the shank and a mandrel assembled in the rivet body and comprising a stem portion extending through the bore and a setting head engaged with a tail end face of the rivet body. Wherein the shank of the rivet body comprises a cylindrical wall of substantially uniform thickness, a head end portion of the wall defining a shank portion of the bore of a first diameter and a tail end portion of the wall defining a tail end portion of the bore of a second, lesser, diameter, and the stem portion of the mandrel is of substantially uniform diameter, which diameter is less than second lesser diameter of the bore, which stem portion is provided with a neck at which the mandrel may break at the end of a setting operation, which neck is located adjacent the junction between the head end portion and the tail end portion of the wall, and the stem portion has an outwardly extending collar portion of the same diameter as the second diameter of the rivet body bore, which collar is spaced from the neck and the setting head of the mandrel and positioned in the tail end portion of the bore.
  • There now follows a description, to be read with reference to the accompanying drawings, of a blind rivet assembly embodying the invention.
  • In the accompanying drawings
  • Figure 1 show a view of a blind rivet assembly embodying the invention in longitudinal section;
  • Figures 2 and 3 show examples of the setting of the rivet of Figure 1.
  • A blind rivet assembly (2) comprises a rivet body (4) which has a shank (6) with a bore (8) extending axially there through an outwardly extending head (10) formed on one end portion of the shank (6). The assembly also comprises a mandrel (12) assembled in the rivet body and comprising a stem portion (14) which is of substantially uniform diameter and a setting head (16) which is engaged with a tail end face (18) of the rivet body (4).
  • The rivet body is conveniently made by extrusion and is preferably of aluminium alloy though other suitable metals may used. The mandrel (12), which is made by a conventional heading and rolling operation is of mild steel.
  • The shank (6) of the rivet body (4) comprises a cylindrical wall (20) of substantially uniform thickness. A head end portion of the wall (20) defines a shank portion (22) of the bore (8) of a first diameter d1, and a tail end portion of the wall (20) defines a tail end portion (24) of the bore (8) of a second diameter d2, less than the diameter d1.
  • The stem portion (14) of the mandrel is of a substantially uniform diameter M, which is less than the diameter d2 and thus less than the diameter d1. The stem portion (14) is provided with a circumferential neck (26) at which the mandrel (12) will break on the completion of a setting operation on the blind rivet assembly (2). The neck (26) is located adjacent the junction between the head end portion and the tail end portion of the wall (20).
  • The stem (14) is provided, between the neck (26) and the head (16), with an outwardly extending collar portion comprising a plurality, in particular four, of lugs (28) having outer faces which are of the same diameter as the second diameter d2 of the rivet body. The lugs (28) thus lie in the tail end portion (24) of the bore (8) in contact with the inner surface of the wall (20).
  • The head (16) of the mandrel (12) is of a diameter which is greater than the outer diameter of the tail end portion of the wall (20) and less than the outer diameter of the shank portion of the wall (20).
  • In a typical rivet embodying the invention
    M is 2.9 mm
    d1 is 3.5 mm
    d2 is 3.0 mm
    Rivet body outside diameter (D) 4.8 mm
    Length of tail end portion (L) 5.0 mm
  • When the rivet assembly is set, the shank of the rivet body (4) is inserted in a hole in a workpiece and a tool is forced to engage the head (10) of the rivet body while drawing the mandrel through the rivet body to set it. When the rivet is set, increased resistance to movement of the mandrel puts a greater strain on the neck of the mandrel which eventually breaks to complete the setting operation.
  • Figures 2 and 3 show the form of setting achieved with a rivet according to the invention.
  • In Figure 2 the rivet assembly (2) has been positioned in a hole through two plates whose combined thicknesses is about the maximum for efficient setting of the rivet. At the commencement of the setting operation the mandrel head (16) draws the tail end portion of the rivet wall downwards, and it not only extrudes outwards, past and round the outer edge of the mandrel head (16), but it also forces compression of the shank portion of the wall (20). This has two effects - firstly it causes metal to flow so that the portion of the wall in the hole in the workpiece fills the hole, and secondly, because of the gap between the outside of the mandrel, the shank portion of the wall concertinas, folding inwards and outwards. Shortly before the mandrel breaks, not only has metal flowed around the outside of the head (16) of the mandrel, but metal also flows either side of the collar portion (28).
  • A setting of the rivet is thus obtained which shows highly desirable characteristics, both in good hole filling ability, reliable and high mandrel head retention after setting, and a well formed head on the set rivet.
  • Figure 3 shows a typical setting of the rivet with a workpiece of a thickness G2 which is approaching the minimum thickness of work piece with which the rivet can effectively be used.

Claims (2)

  1. A blind rivet assembly comprising a rivet body having a shank with a bore extending axially therethrough and a head formed on one end portion of the shank and a mandrel assembled in the rivet body and comprising a stem portion extending through the bore and a setting head engaged with a tail end face of the rivet body, wherein the shank of the rivet body comprises a cylindrical wall of substantially uniform thickness, a head end portion of the wall defining a shank portion of the bore of a first diameter and a tail end portion of the wall defining a tail end portion of the bore of a second, lesser, diameter, and the stem portion of the mandrel is of substantially uniform diameter, which diameter is less than said second lesser diameter of the bore, which stem portion is provided with a neck at which the mandrel may break at the end of a setting operation, which neck is located adjacent the junction between the head end portion and the tail end portion of the wall, and the stem portion has an outwardly extending collar portion of the same diameter as the second diameter of the rivet body bore, which collar portion is spaced from the neck and the setting head of the mandrel and positioned in the tail end portion of the bore.
  2. A rivet assembly according to Claim 1 wherein the setting head of the mandrel is greater in diameter than the tail end portion of the wall and less in diameter than the head end portion of the wall.
EP19950304220 1994-07-05 1995-06-19 Blind rivet assembly Expired - Lifetime EP0691479B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9413516 1994-07-05
GB9413516A GB9413516D0 (en) 1994-07-05 1994-07-05 Blind rivet assembly

Publications (2)

Publication Number Publication Date
EP0691479A1 EP0691479A1 (en) 1996-01-10
EP0691479B1 true EP0691479B1 (en) 1999-03-17

Family

ID=10757831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950304220 Expired - Lifetime EP0691479B1 (en) 1994-07-05 1995-06-19 Blind rivet assembly

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EP (1) EP0691479B1 (en)
DE (1) DE69508312T2 (en)
ES (1) ES2131769T3 (en)
GB (1) GB9413516D0 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9624710D0 (en) * 1996-11-28 1997-01-15 Milladale Ltd Blind rivet and method of making the same
WO2011094056A1 (en) * 2010-01-27 2011-08-04 Illinois Tool Works Inc. Fastener assembly
DE102012016592A1 (en) 2012-08-16 2014-02-20 Newfrey Llc blind rivet
US9573187B2 (en) 2013-03-15 2017-02-21 Sps Technologies, Llc Blind, bulbing, tacking rivet and method of installation
CA2900081C (en) * 2013-03-15 2017-03-14 Sps Technologies, Llc Blind, bulbing, tacking rivet and method of installation
CN109952441B (en) * 2016-08-12 2022-09-30 伊利诺斯工具制品有限公司 Rivet fastener assembly
EP3366384B1 (en) * 2017-02-23 2019-11-27 Newfrey LLC Method of manufacturing a blind rivet, blind rivet and fixing assembly
DE102019101078A1 (en) 2018-01-16 2019-07-18 Illinois Tool Works Inc. NIET FASTENER ELEMENT DESIGN AND METHOD OF USE THEREOF
US11268557B2 (en) 2018-10-10 2022-03-08 Illinois Tool Works Inc. Rivet fastener assembly and method of use thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB574766A (en) * 1944-06-06 1946-01-18 Piotr Kubicki Improvements in or relating to rivets
DE2625023A1 (en) * 1975-06-13 1976-12-23 Aerpat Ag BLIND RIVET
IT1175797B (en) 1984-06-21 1987-07-15 Oggionni Tac Riveting Syst Sas BLIND, TEAR RIVET, PROVIDED WITH A TUBULAR BODY LIKELY TO WITHDRAW, BY ACTION OF THE SPINDLE, FORMING ONE OR MORE CIRCUMFERENTIAL EXPANSIONS, OF RETAINING THE PIECES TO BE JOINED
US4789283A (en) * 1985-07-02 1988-12-06 Pavco Industries, Inc. Fluid-tight blind rivet
FR2587767B3 (en) * 1985-09-24 1988-04-15 Joux Jean Claude RIVET WITH INTERNAL CHAMBER FOR RIVETING MULTIPLE THICKNESSES WITH A SINGLE TYPE OF RIVET
US5044850A (en) * 1990-05-11 1991-09-03 Avdel Corporation Self plugging blind rivet
GB2260585A (en) 1991-10-09 1993-04-21 Avdel Systems Ltd Self-plugging blind rivet

Also Published As

Publication number Publication date
GB9413516D0 (en) 1994-08-24
DE69508312T2 (en) 1999-09-30
EP0691479A1 (en) 1996-01-10
DE69508312D1 (en) 1999-04-22
ES2131769T3 (en) 1999-08-01

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